2.1.27 [ECMA-262/5] Section 18.104.22.168, Array.prototype.map ( callbackfn [ , thisArg ] )
NOTE The map function is intentionally generic; it does not require that its this value be an Array object. Therefore it can be transferred to other kinds of objects for use as a method. Whether the map function can be applied successfully to a host object is implementation-dependent.
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The map method can be applied to a host object; however, some host objects may reject such an application.